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• VMware NAS/iSCSI recommendations - smallish organization

  - by Bubnoff

  I have two VMware servers - ESX + ESXi. Two backup NAS boxes. The current NAS boxes are low-cost and unsuitable for running VMs from. Support NFS only. Slow. My plan is to have a dedicated iSCSI/NAS for storing and running VMs. Two additional low-cost boxes for backup. I'm looking for advice regarding 2 things really: Recommendations as far as VMware architecture/design for a smaller organization. Less than 20 Virtual Machines. 2 servers + 2 x 1.5 terabyte backup NAS boxes. A good NAS/iSCSI box with your recommendation on RAID config ...I would go with 6 or better. I'm trying to design an installation that is both fast and reliable/redundant. If you have any experiences to share or your current configuration including network design ( switches, fiber ...etc ), I will be enormously thankful. I'm not married to this idea, so if you have a design not using iSCSI NAS boxes ...let er rip. Cost? Can we stay around $5,000 ( on top of already stated components )? Links to info are welcome also. Thanks for reading! Bubnoff

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• Slow filesystem access

  - by danneh3826

  I'm trying to diagnose a slow filesystem issue on a server I look after. It's been ongoing for quite some time, and I've run out of ideas as to what I can try. Here's the thick of it. The server itself is a Dell Poweredge T310. It has 4 SAS hard drives in it, configured at RAID5, and is running Citrix XenServer 5.6. The VM is a (relatively) old Debian 5.0.6 installation. It's given 4 cores, and 4Gb's of RAM. It has 3 volumes. A 10Gb volume (ext3) for the system, 980Gb volume (xfs) for data (~94% full), and another 200Gb volume (xfs) for data (~13% full). Now here's the weird thing. Read/write access to the 980Gb volume is really slow. I might get 5Mb/s out of it if I'm lucky. At first I figured it was actually disk access in the system, or at a hypervisor level, but ruled that out entirely as other VMs on the same host are running perfectly fine (a good couple hundred Mb/s disk r/w access). So then I started to target this particular VM. I started thinking it was XFS, but to prove it I wasn't going to attempt to change the filesystem on the 980Gb drive, with years and years of billions of files on there. So I provisioned the 200Gb drive, and did the same read/write test (basically dd), and got a good couple hundred Mb/s r/w access to it. So that ruled out the VM, the hardware, and the filesystem type. There's also a lot of these in /var/log/kern.log; (sorry, this is quite long) Sep 4 10:16:59 uriel kernel: [32571790.564689] httpd: page allocation failure. order:5, mode:0x4020 Sep 4 10:16:59 uriel kernel: [32571790.564693] Pid: 7318, comm: httpd Not tainted 2.6.32-4-686-bigmem #1 Sep 4 10:16:59 uriel kernel: [32571790.564696] Call Trace: Sep 4 10:16:59 uriel kernel: [32571790.564705] [<c1092a4d>] ? __alloc_pages_nodemask+0x476/0x4e0 Sep 4 10:16:59 uriel kernel: [32571790.564711] [<c1092ac3>] ? __get_free_pages+0xc/0x17 Sep 4 10:16:59 uriel kernel: [32571790.564716] [<c10b632e>] ? __kmalloc+0x30/0x128 Sep 4 10:16:59 uriel kernel: [32571790.564722] [<c11dd774>] ? pskb_expand_head+0x4f/0x157 Sep 4 10:16:59 uriel kernel: [32571790.564727] [<c11ddbbf>] ? __pskb_pull_tail+0x41/0x1fb Sep 4 10:16:59 uriel kernel: [32571790.564732] [<c11e4882>] ? dev_queue_xmit+0xe4/0x38e Sep 4 10:16:59 uriel kernel: [32571790.564738] [<c1205902>] ? ip_finish_output+0x0/0x5c Sep 4 10:16:59 uriel kernel: [32571790.564742] [<c12058c7>] ? ip_finish_output2+0x187/0x1c2 Sep 4 10:16:59 uriel kernel: [32571790.564747] [<c1204dc8>] ? ip_local_out+0x15/0x17 Sep 4 10:16:59 uriel kernel: [32571790.564751] [<c12055a9>] ? ip_queue_xmit+0x31e/0x379 Sep 4 10:16:59 uriel kernel: [32571790.564758] [<c1279a90>] ? _spin_lock_bh+0x8/0x1e Sep 4 10:16:59 uriel kernel: [32571790.564767] [<eda15a8d>] ? __nf_ct_refresh_acct+0x66/0xa4 [nf_conntrack] Sep 4 10:16:59 uriel kernel: [32571790.564773] [<c103bf42>] ? _local_bh_enable_ip+0x16/0x6e Sep 4 10:16:59 uriel kernel: [32571790.564779] [<c1214593>] ? tcp_transmit_skb+0x595/0x5cc Sep 4 10:16:59 uriel kernel: [32571790.564785] [<c1005c4f>] ? xen_restore_fl_direct_end+0x0/0x1 Sep 4 10:16:59 uriel kernel: [32571790.564791] [<c12165ea>] ? tcp_write_xmit+0x7a3/0x874 Sep 4 10:16:59 uriel kernel: [32571790.564796] [<c121203a>] ? tcp_ack+0x1611/0x1802 Sep 4 10:16:59 uriel kernel: [32571790.564801] [<c10055ec>] ? xen_force_evtchn_callback+0xc/0x10 Sep 4 10:16:59 uriel kernel: [32571790.564806] [<c121392f>] ? tcp_established_options+0x1d/0x8b Sep 4 10:16:59 uriel kernel: [32571790.564811] [<c1213be4>] ? tcp_current_mss+0x38/0x53 Sep 4 10:16:59 uriel kernel: [32571790.564816] [<c1216701>] ? __tcp_push_pending_frames+0x1e/0x50 Sep 4 10:16:59 uriel kernel: [32571790.564821] [<c1212246>] ? tcp_data_snd_check+0x1b/0xd2 Sep 4 10:16:59 uriel kernel: [32571790.564825] [<c1212de3>] ? tcp_rcv_established+0x5d0/0x626 Sep 4 10:16:59 uriel kernel: [32571790.564831] [<c121902c>] ? tcp_v4_do_rcv+0x15f/0x2cf Sep 4 10:16:59 uriel kernel: [32571790.564835] [<c1219561>] ? tcp_v4_rcv+0x3c5/0x5c0 Sep 4 10:16:59 uriel kernel: [32571790.564841] [<c120197e>] ? ip_local_deliver_finish+0x10c/0x18c Sep 4 10:16:59 uriel kernel: [32571790.564846] [<c12015a4>] ? ip_rcv_finish+0x2c4/0x2d8 Sep 4 10:16:59 uriel kernel: [32571790.564852] [<c11e3b71>] ? netif_receive_skb+0x3bb/0x3d6 Sep 4 10:16:59 uriel kernel: [32571790.564864] [<ed823efc>] ? xennet_poll+0x9b8/0xafc [xen_netfront] Sep 4 10:16:59 uriel kernel: [32571790.564869] [<c11e40ee>] ? net_rx_action+0x96/0x194 Sep 4 10:16:59 uriel kernel: [32571790.564874] [<c103bd4c>] ? __do_softirq+0xaa/0x151 Sep 4 10:16:59 uriel kernel: [32571790.564878] [<c103be24>] ? do_softirq+0x31/0x3c Sep 4 10:16:59 uriel kernel: [32571790.564883] [<c103befa>] ? irq_exit+0x26/0x58 Sep 4 10:16:59 uriel kernel: [32571790.564890] [<c118ff9f>] ? xen_evtchn_do_upcall+0x12c/0x13e Sep 4 10:16:59 uriel kernel: [32571790.564896] [<c1008c3f>] ? xen_do_upcall+0x7/0xc Sep 4 10:16:59 uriel kernel: [32571790.564899] Mem-Info: Sep 4 10:16:59 uriel kernel: [32571790.564902] DMA per-cpu: Sep 4 10:16:59 uriel kernel: [32571790.564905] CPU 0: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564908] CPU 1: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564911] CPU 2: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564914] CPU 3: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564916] Normal per-cpu: Sep 4 10:16:59 uriel kernel: [32571790.564919] CPU 0: hi: 186, btch: 31 usd: 175 Sep 4 10:16:59 uriel kernel: [32571790.564922] CPU 1: hi: 186, btch: 31 usd: 165 Sep 4 10:16:59 uriel kernel: [32571790.564925] CPU 2: hi: 186, btch: 31 usd: 30 Sep 4 10:16:59 uriel kernel: [32571790.564928] CPU 3: hi: 186, btch: 31 usd: 140 Sep 4 10:16:59 uriel kernel: [32571790.564931] HighMem per-cpu: Sep 4 10:16:59 uriel kernel: [32571790.564933] CPU 0: hi: 186, btch: 31 usd: 159 Sep 4 10:16:59 uriel kernel: [32571790.564936] CPU 1: hi: 186, btch: 31 usd: 22 Sep 4 10:16:59 uriel kernel: [32571790.564939] CPU 2: hi: 186, btch: 31 usd: 24 Sep 4 10:16:59 uriel kernel: [32571790.564942] CPU 3: hi: 186, btch: 31 usd: 13 Sep 4 10:16:59 uriel kernel: [32571790.564947] active_anon:485974 inactive_anon:121138 isolated_anon:0 Sep 4 10:16:59 uriel kernel: [32571790.564948] active_file:75215 inactive_file:79510 isolated_file:0 Sep 4 10:16:59 uriel kernel: [32571790.564949] unevictable:0 dirty:516 writeback:15 unstable:0 Sep 4 10:16:59 uriel kernel: [32571790.564950] free:230770 slab_reclaimable:36661 slab_unreclaimable:21249 Sep 4 10:16:59 uriel kernel: [32571790.564952] mapped:20016 shmem:29450 pagetables:5600 bounce:0 Sep 4 10:16:59 uriel kernel: [32571790.564958] DMA free:2884kB min:72kB low:88kB high:108kB active_anon:0kB inactive_anon:0kB active_file:5692kB inactive_file:724kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15872kB mlocked:0kB dirty:8kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:5112kB slab_unreclaimable:156kB kernel_stack:56kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 4 10:16:59 uriel kernel: [32571790.564964] lowmem_reserve[]: 0 698 4143 4143 Sep 4 10:16:59 uriel kernel: [32571790.564977] Normal free:143468kB min:3344kB low:4180kB high:5016kB active_anon:56kB inactive_anon:2068kB active_file:131812kB inactive_file:131728kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:715256kB mlocked:0kB dirty:156kB writeback:0kB mapped:308kB shmem:4kB slab_reclaimable:141532kB slab_unreclaimable:84840kB kernel_stack:1928kB pagetables:22400kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 4 10:16:59 uriel kernel: [32571790.564983] lowmem_reserve[]: 0 0 27559 27559 Sep 4 10:16:59 uriel kernel: [32571790.564995] HighMem free:776728kB min:512kB low:4636kB high:8760kB active_anon:1943840kB inactive_anon:482484kB active_file:163356kB inactive_file:185588kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3527556kB mlocked:0kB dirty:1900kB writeback:60kB mapped:79756kB shmem:117796kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 4 10:16:59 uriel kernel: [32571790.565001] lowmem_reserve[]: 0 0 0 0 Sep 4 10:16:59 uriel kernel: [32571790.565011] DMA: 385*4kB 16*8kB 3*16kB 9*32kB 6*64kB 2*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2900kB Sep 4 10:16:59 uriel kernel: [32571790.565032] Normal: 21505*4kB 6508*8kB 273*16kB 24*32kB 3*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 143412kB Sep 4 10:16:59 uriel kernel: [32571790.565054] HighMem: 949*4kB 8859*8kB 7063*16kB 6186*32kB 4631*64kB 727*128kB 6*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 776604kB Sep 4 10:16:59 uriel kernel: [32571790.565076] 198980 total pagecache pages Sep 4 10:16:59 uriel kernel: [32571790.565079] 14850 pages in swap cache Sep 4 10:16:59 uriel kernel: [32571790.565082] Swap cache stats: add 2556273, delete 2541423, find 82961339/83153719 Sep 4 10:16:59 uriel kernel: [32571790.565085] Free swap = 250592kB Sep 4 10:16:59 uriel kernel: [32571790.565087] Total swap = 385520kB Sep 4 10:16:59 uriel kernel: [32571790.575454] 1073152 pages RAM Sep 4 10:16:59 uriel kernel: [32571790.575458] 888834 pages HighMem Sep 4 10:16:59 uriel kernel: [32571790.575461] 11344 pages reserved Sep 4 10:16:59 uriel kernel: [32571790.575463] 1090481 pages shared Sep 4 10:16:59 uriel kernel: [32571790.575465] 737188 pages non-shared Now, I've no idea what this means. There's plenty of free memory; total used free shared buffers cached Mem: 4247232 3455904 791328 0 5348 736412 -/+ buffers/cache: 2714144 1533088 Swap: 385520 131004 254516 Though now I see the swap is relatively low in size, but would that matter? I've been starting to think about fragmentation, or inode usage on that large partition, but a recent fsck on it showed is as only like 0.5% fragmented. Which leaves me with inode usage, but how much of an effect really would a large inode table or filesystem TOC have? I've love to hear people's opinions on this. It's driving me potty! df -h output; Filesystem Size Used Avail Use% Mounted on /dev/xvda1 9.5G 6.6G 2.4G 74% / tmpfs 2.1G 0 2.1G 0% /lib/init/rw udev 10M 520K 9.5M 6% /dev tmpfs 2.1G 0 2.1G 0% /dev/shm /dev/xvdb 980G 921G 59G 94% /data

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• ASP.NET Session State SQL Server 2008 R2 Freezes with High CPU Usage

  - by jtseng

  Our ASP.Net website uses SQL Server as the session state provider. We currently host the database on SQL Server 2005 since it does not play well on 2008 R2. We would like to know why, and how to fix it. hardware setup Our current session state server has SQL Server 2005 with the files hosted on a single local disk. It is one of our oldest servers since it has served us well, and we never felt the need to upgrade it. The database is about 2 GB holding 6000 sessions. (The sessions are a little big, but we need it.) We have another server with SQL Server 2008 R2 with a much faster CPU, much more RAM, and a much faster hard disk. situation One day, we have a huge surge in traffic. The transaction log growth on SQL Server freezes the server for 10's of seconds, allowing only a few requests through in minutes. So we load up the new server with ASPState with very large data and log files and point all of our applications to the new server. It chugs along fine for about 5 minutes, and then the CPU usage jumps up to 50% of the 16 cores that Standard Edition can use and freezes for 10's of seconds at a time. The files do not record any autogrowth events. The disk queue is nice and low. RAM usage is low. CPU usage on our old server has never been higher than 5%. What happened on the new server? Alternatively, I would like to hear success stories with ASP.NET session state server running on SQL Server 2008 R2 with an average write load of 30MB/sec with bursts up to 200MB/sec.

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• Looking to get a small server – need web, PHP, PostgreSQL.

  - by Javawag

  Hi all! I'm looking to get a cheap (low end) server to serve web pages (xHTML/PHP), but I also need to be able to set up PostGreSQL on the system too. Ideally the server would have low power consumption, run Linux (I prefer Mac OS X but a Mac Mini, although the size I'm looking for, is too much money!) and be around £100 (~$160US). EDIT: Just to make it clearer, I'm looking to purchase the server hardware myself – but I want something about Mac Mini sized. I don't want to pay for hosting! Also, quick question – if it's to serve web pages from my home (standard ISP connection, no static IP!), what do I need in place to get this working. I'm guessing I would sign up with some service like no-ip, and register a domain to point to my no-ip address (then install the no-ip software on the server to update that with the current IP). I know the idea of running a server behind a normal ISP connection isn't very elegant, but I'd prefer to have the server where I can see it then pay over the odds for a hosting service where I have little to no control over what happens. Also, I could write my own server software for apps/etc to connect to as well. Anyways I'm rambling! What do you guys think?! Javawag

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• Hibernate between OS X and Bootcamp Win 7

  - by Willem

  Wouldn't it be great if someone wrote a guide or an app which allowed you to switch instantly between OS X and Windows using Hibernate in both OS:s? Windows 7 already has an option "Hibernate" which allows you to boot back to your OS X partition, but OS X does not exactly offer the same. However, there are possibilities here. It seems that the recent Mac's have 3 different kinds of sleeping mode: Sleep: Low power consumption, RAM still active. Legacy Safe Sleep: No power consumption(?), writes RAM to disk and shuts down (is this the same as Hibernate?) Safe Sleep: Writes RAM to disk and enters sleep mode. If battery level drops too low it goes into Hibernate (is this Hibernate the same as #2 in this list? This is the Hibernate I will be referring to int he rest of this post) It seems that I am unable to force my MacBook Pro (Late 2011) OS X 10.7.3 into a true hibernate using either command line or apps that are supposed to do this. I believe the Mac should show that white loading bar whilst waking up if it was truly put into hibernate (which it does not). But I can get this white bar to show by letting my battery level drop to 0% so there is obviously a system function for it (obviously, duh! :). When Win 7 goes into hibernate it shuts down completely and you can then boot into OS X on startup. On OS X however, hibernate forces you to wake up into OS X. Can you hack this so that you're allowed to select boot partition after OS X hibernates? Would it be possible to use the true hibernate system functionalities of Win 7 and OS X to create a kind of instant switching between the two? Imagine this on a quick SATA-3 SSD like my 180GB Intel 520. Thanks / Willem

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• High fan speed with no reason

  - by Klaus

  For a few weeks, the fans of my Lenovo B590 laptop, running on Xubuntu 14, turn to high speed a few minutes after it is turned on. The fans won't speed down until I turn the computer off. This is quite strange, since This didn't happen before The temperatures are quite low (are they ?) $sensors Adapter: Virtual device temp1: +36.0°C (crit = +88.0°C) temp2: +30.0°C (crit = +126.0°C) coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +37.0°C (high = +72.0°C, crit = +90.0°C) Core 0: +34.0°C (high = +72.0°C, crit = +90.0°C) Core 1: +31.0°C (high = +72.0°C, crit = +90.0°C) thinkpad-isa-0000 Adapter: ISA adapter fan1: 0 RPM pkg-temp-0-virtual-0 Adapter: Virtual device temp1: +37.0°C $sudo hddtemp /dev/sda /dev/sda: ST500LT012-9WS142: 33°C The computer is under low load: top - 08:30:15 up 16 min, 2 users, load average: 0.28, 0.23, 0.23 Tasks: 197 total, 1 running, 196 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.8 us, 0.5 sy, 0.0 ni, 98.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 3607944 total, 1973956 used, 1633988 free, 99660 buffers KiB Swap: 3744764 total, 0 used, 3744764 free. 789936 cached Mem The BIOS is up to date (and there are no fan settings in it) The fan is clean and dust-free Why would the BIOS turn the fans to high speed where there seem to be no reason for that ? It seems that we cannot control the fan manually with this model, so I guess the only solution is to understand why this happens.

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• Disk Activity Alert Windows SBS 2003 on Dell PowerEdge 830 with Raid

  - by Ron Whites

  Background: I have a Dell PowerEdge 830 Server running Windows SB Server 2003. It has 4gbs of RAM and a ATA CERC SATA 6CH controller with 3 160gb drives in a Raid 5 configuration. The Problem I am seeing Admin ---"Disk Activity Alert on Server" emails These often occur when disk backups, de-frag or high disk usage is going on. Generally the server isn't over stressed. The Disk Alert emails say in part ... The following disk has low idle time, which may cause slow response time when reading or writing files to the disk. Disk: 0 C: F: D: Review the Disk Transfers/sec and % Idle Time counters for the PhysicalDisk performance object. If the Disk Transfers/sec counter is consistently below 150 while the % Idle Time counter remains very low (close to 0), there may be a problem with the disk driver or hardware. The Questions I have: With what utility can I review the Disk Transfers/sec and Idle Time? It appears there is no utility for that on the server! I think I may need to download a very large (two DVD) Dell "OpenManage" utility to be able to monitor the raid system and see what is a problem is that true?

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• Why does apache httpd tell me that my name-based virtualhosts only works with SNI enabled browers (RFC 4366)

  - by Arlukin

  Why does apache give me this error message in my logs? Is it a false positive? [warn] Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366) I have recently upgraded from Centos 5.7 to 6.3, and by that to a newer httpd version. I have always made my ssl virtualhost configurations like below. Where all domains that share the same certificate (mostly/always wildcard certs) share the same ip. But never got this error message before (or have I, maybe I haven't looked to enough in my logs?) From what I have learned this should work without SNI (Server Name Indication) Here is relevant parts of my httpd.conf file. Without this VirtualHost I don't get the error message. NameVirtualHost 10.101.0.135:443 <VirtualHost 10.101.0.135:443> ServerName sub1.domain.com SSLEngine on SSLProtocol -all +SSLv3 +TLSv1 SSLCipherSuite ALL:!aNull:!EDH:!DH:!ADH:!eNull:!LOW:!EXP:RC4+RSA+SHA1:+HIGH:+MEDIUM SSLCertificateFile /opt/RootLive/etc/ssl/ssl.crt/wild.fareoffice.com.crt SSLCertificateKeyFile /opt/RootLive/etc/ssl/ssl.key/wild.fareoffice.com.key SSLCertificateChainFile /opt/RootLive/etc/ssl/ca/geotrust-ca.pem </VirtualHost> <VirtualHost 10.101.0.135:443> ServerName sub2.domain.com SSLEngine on SSLProtocol -all +SSLv3 +TLSv1 SSLCipherSuite ALL:!aNull:!EDH:!DH:!ADH:!eNull:!LOW:!EXP:RC4+RSA+SHA1:+HIGH:+MEDIUM SSLCertificateFile /opt/RootLive/etc/ssl/ssl.crt/wild.fareoffice.com.crt SSLCertificateKeyFile /opt/RootLive/etc/ssl/ssl.key/wild.fareoffice.com.key SSLCertificateChainFile /opt/RootLive/etc/ssl/ca/geotrust-ca.pem </VirtualHost>

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• Apache suddenly very slow on http and faster on https

  - by hsnm

  Background: I have Apache 2 running on ubuntu. There is a low usage on it and mostly being accessed for a web service URL from mobile apps. It was working fine until I installed SSL certificates. I now have both http and https. When I access the server using https, I get a fairly quick response (but probably not as fast as before). When I use http, it's so slow. What I tried: From this post: I curl localhost from the host and it takes some time, meaning there is no routing issue. The server runs on Amazon EC2 instance and is managed by me only. Also: I see that Apache once running, creates the maximum number of processes it is allowed to, which was not the case before. I lowered the MaxClients to 20 and I think I'm getting faster responses but it still takes over a minute and I always have MaxClients Apache processes. dmesg returns many [ 1953.655703] TCP: Possible SYN flooding on port 80. Sending cookies. When I netstat I get many entries with SYN_RECV. Possibly a DDoS attack? From EC2's monitoring diagrams I see a pattern of high "Maximum Network In (Bytes)" since 2 days ago. By the way the server is still being tested, the actual traffic is very low and not consistent. I tried to go with this solution to limit incoming connections using iptables, still no luck, but I'm trying. Question: What could be the problem? Is this a DDoS attack?

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• How to fix high Load_Cycle_Count laptop drive (TOSHIBA MK6006GAH in Vaio TX1XP)?

  - by Sam Brightman

  Hoping someone knows exactly what's going on here. It seems this drive has some combination of aggressive power saving settings and Ubuntu defaults that has massively increased the Load_Cycle_Count for the drive: https://wiki.ubuntu.com/DanielHahler/Bug59695 So the drive is now so slow that it cannot boot because it takes long enough to access the data that the kernel will not recognise it properly. I'm not worried about the data on the drive, but would really like to keep the laptop functioning. There is some indication that this is possible because the figure is still low 200,000s and most drives supposedly go to 600,000. Additionally, SMART tests pass and consider the drive healthy and without errors. But the really surprising thing was when I ran mhdd... Every single read came up red (slow) until I pressed 'R' for reset drive. I noticed the next read was normal speed, so held down 'R'. Magically the drive read perfectly for as long as I held the key BUT resumed slow (and noisy) seeking/reading after releasing. I don't think the source code to mhdd is available, so I'm not exactly sure what this means (besides, I don't know enough low-level HDD stuff either). It seems like the drive should be able to work, but is stuck trying to power save or something. There are no BIOS options on the laptop. Does anyone know how I can stop the drive from doing extremely slow/noisy operations like this? Or is constantly resetting the drive also damanging, and only causing it to work well by luck (i.e. not a suggestion that it's fixable)?

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• Can applications use all of the memory in Windows 8?

  - by Barleyman

  Windows 7 (and Windows Vista) have a built-in limit of not being able to use the last 25% of RAM. You will get a low memory warning when you get close to the limit. Even if you disable that warning, applications will run out of memory and crash since the OS will refuse to allocate memory from that last 25%. That was fine when Vista was designed, when machines had 1 GB of total memory, but is pretty daft for today's 8 GB machines. Yes, the system will run cache, etc. on that extra 2 GB, but running out of memory when you have "merely" 2 GB left.... NB: this has nothing to do with the page file. If you limit the page file to a sensible size like 2 GB, you will still see this behavior. The system will cram the page file to the last byte while refusing to touch that 1/4th of the RAM. Does Windows 8 change this behavior? Is there now some fixed minimum free RAM requirement, like 512 MB, or is it still 25%? Can you actually adjust the low memory limit?

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• Tuning up a MySQL server

  - by NinjaCat

  I inherited a mysql server, and so I've started with running the MySQLTuner.pl script. I am not a MySQL expert but I can see that there is definitely a mess here. I'm not looking to go after every single thing that needs fixing and tuning, but I do want to grab the major, low hanging fruit. Total Memory on the system is: 512MB. Yes, I know it's low, but it's what we have for the time being. Here's what the script had to say: General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries When making adjustments, make tmp_table_size/max_heap_table_size equal Reduce your SELECT DISTINCT queries without LIMIT clauses Increase table_cache gradually to avoid file descriptor limits Your applications are not closing MySQL connections properly Variables to adjust: query_cache_limit (> 1M, or use smaller result sets) tmp_table_size (> 16M) max_heap_table_size (> 16M) table_cache (> 64) innodb_buffer_pool_size (>= 326M) For the variables that it recommends that I adjust, I don't even see most of them in the mysql.cnf file. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] innodb_buffer_pool_size = 220M innodb_flush_log_at_trx_commit = 2 innodb_file_per_table = 1 innodb_thread_concurrency = 32 skip-locking big-tables max_connections = 50 innodb_lock_wait_timeout = 600 slave_transaction_retries = 10 innodb_table_locks = 0 innodb_additional_mem_pool_size = 20M user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp skip-external-locking bind-address = localhost key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 4 myisam-recover = BACKUP query_cache_limit = 1M query_cache_size = 16M log_error = /var/log/mysql/error.log expire_logs_days = 10 max_binlog_size = 100M skip-locking innodb_file_per_table = 1 big-tables [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] [isamchk] key_buffer = 16M !includedir /etc/mysql/conf.d/

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• Youtube has no voice but the music continues just fine?

  - by Prix

  PC CONFIG: gigabyte EP45C UD3R with the realtek HD onboard 4gb dual channel Qcore 2.83ghz When i watch to videos on youtube now the voice some times is in static and some times so low that you can hear it while the sound continues just fine... For example if can hear to things like guitar or a train etc but the voice of whoever is speaking is gone or very low or pure static when watching the videos. I know some videos have a really great quality and some are HD 1080p so this was something not expected to happen. I can aswell play videos on my WMP11 just fine i have ccc-p installed also tried k-lite, both on the latest stable avaiable. I havent tried anything else related to flash but something is either wrong with my drivers or youtube. I have installed the latest drivers to make sure they are up-to-date but this didnt help either. What i have tried so far: removed the audio drivers and re-installed remove any codec pack i had and re-installed k-lite, test, didnt worked remove any codec pack i had and re-installed cccp, test, didnt worked checked the control panel sound configurations, tried chaging to phone stereo, to 5.1 which is what my headphone is. checked the realtek manager, tried changing the sound channels from 2CH to 6CH to reflect my headphone, didnt work. rebooted after every change of the above tries. tried chrome, firefox and internet explorer with the same results didnt w

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• Linux Centos 6 becomes unavailable from time to time - OS&network issue

  - by adoado0

  I am encountering following problem. There is one server (DL160 G5) running Centos 6.3 with default kernel 2.6.32-220.2.1.el6.x86_64 - at this point I'd like to add that issue appeared also at older version - 6.1 and older kernel (do not remember exactly which version). There is cPanel installed and from time to time it becomes unavailable (network connection). What I've checked is (via KVMoIP): load average is completely normal it does not lack memory or disk space when problem occurs no console notifications checked all access logs and there is no sign that it can be caused by a client script cannot even access local interface (127.0.0.1) or main IP address running tcpdump I can only see packets arriving to server - no responses all services seem to be running properly (mail,sql,http,ssh) checked crontab and all clients' crontabs too network port utilisation is low ( up to several Mbits) arriving packet rate is low - hundreds per second (according to tcpdump) console (via kvmoip) works fine, no lags there is no conntrack at this server there is no ipv6 at this server flushing iptables, unloading modules does not resolve problem restarting network does not resolve problem, no errors appear it also occurs when two sepearate networks are configured (and multiple gateways) as well as one IP, one default gw and one network is configured - so it seems network configuration independent it seems to repeat randomly (load,packet rate,bandwith usage,load independent) checked server with different rootkit detection tools - it seems to be clean server has been rebooted, it did not change anything there are no interface errors it apperas randomly can be once a week or several times per day It usually works fine after 1-15 minutes. What I can also check? It is definitely OS issue - there is traffic at interface only in one direction when problem occurs, can not even ping loopback. Any ideas? Recommended checks? Anything I did not checked above.

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• Good Hosting Providers With Zend Framework Support [closed]

  - by manyxcxi

  I currently use ixwebhosting for my hosting services. They're cheap and work (most of the time). The databases are horribly slow, the servers are horribly slow, and their support (though usually prompt) is tough to deal with. That being said, they're cheap, I've got like 20 domains hosted in my account, none of them are high volume, and they work JUST good enough- until today. This isn't meant to be a condemnation of ixwh though. Their prices are very low for what they do offer and most things work just fine, most of the time. I need to be able to host web apps written with Zend Framework in a fairly easy fashion. The server performance can't be worse than what I've already had (a pretty low hurdle to clear), and I don't want to spend $30/mo. These are not money making websites- they're projects. My requirements are PHP 5.3, ZF support, MySQL databases, multiple domains- not much. Who should I look at, and who should I look out for?

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• SQL Server: Network pauses after installing cheap SATA card: Is there a solution?

  - by samsmith

  At the risk of being assigned to the "bad DBA" club... I did something desperate, and may have to undo it. Problem: After installing a low cost eSATA board, my SQL Server is intermittently unresponsive (seemingly when there is a lot of IO to the eSATA drive). Questions: 1) Is there a solution to the intermittent unresponsiveness that allows me to keep the eSATA in place? 2) Whether or not (1==true): What is a decent, low cost way to add 1-3 TB storage to SQL for non-critical SQL DBs? Detail: Our SAN is full, and expanding it is costly and will take a month. I have a pressing need to add 1-3 TB for some development DBs (e.g. not mission critical; data loss is OK). As a bandaid, I threw a $20 eSATA PCI board in the Dell 1950 server, and attached an external 2TB eSATA drive. This seemed to work fine, but I notice that our production SQL DBs, and even remote desktop, now experience network "pauses" that they never did before (with both SQL client apps and remote desktop throwing "networking problem" errors). This SQL Server has lots of memory, and runs an instance of SQL 2005 (where all line of business apps reside) and an instance SQL 2008 (for development db's). SQL Server RAM has been appropriately configured, and this setup has run great for years. The server is: Dell 1950 Win2003 x64 14GB RAM PERC controller, 2 mirrored hd's internal Dell SAN over gbit ethernet, dual homed 2 PCIx slots (1 used by NIC for SAN, 1 now in use for eSATA board) Thank you for suggestions!

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• Python 2.7 and Ubuntu 10.10: X11 fails

  - by c.a.p.

  Against every recommendation I have apt-get remove python in Ubuntu 10.10 (build 2.6.24-29-server x86_64) and apt-get install python2.7 Some built-in software with python2.6 dependencies (like firefox, other minor stuff) was fixed just by apt-get reinstalling or reinstalling from source and the system was stable for one day until I rebooted. Upon booting I got the message "ubuntu is running in low-graphics mode" I have an NVIDIA Quadro NVS 295 256 running on a HP Z600 Workstation so I sudoed: apt-get --purged nvidia* apt-get --purged xserver apt-get install linux-headers-generic apt-get install nvidia-* apt-get install xserver-xorg dpkg-reconfigure xserver-xorg nvidia-xconfig upon rebooting i get the same "ubuntu is running in low-graphics mode" if I decide to tell the boot menu to restart X, the Ubuntu 10.10 "load screen" shows up and does not do anything for hours. If I "X" the screen remains black for hours; ctrl-c shows that /etc/X11/xorg.conf did not produce any errors just a warning "Type "ONE_LEVEL"...". /var/log/Xorg.0.log issues the following warnings (no errors) (WW) AllowEmptyInput is on (WW) NVIDIA(0): UBB is incompatible If I "startX" I get /usr/bin/python: can't find '__main__.py"' in '/usr/share/command-not-found' Before re-installing xserver-xorg however "startX" ran, just by changing the resolution of the tty1 console. Any hints?

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• Visual Basic 2010 Language Enhancements

  Earlier this month Microsoft released Visual Studio 2010, the .NET Framework 4.0 (which includes ASP.NET 4.0), and new versions of their core programming languages: C# 4.0 and Visual Basic 10 (also referred to as Visual Basic 2010). Previously, the C# and Visual Basic programming languages were managed by two separate teams within Microsoft, which helps explain why features found in one language was not necessarily found in the other. For example, C# 3.0 introduced collection initializers, which enable developers to define the contents of a collection when declaring it; however, Visual Basic 9 did not support collection initializers. Conversely, Visual Basic has long supported optional parameters in methods, whereas C# did not. Recently, Microsoft merged the Visual Basic and C# teams to help ensure that C# and Visual Basic grow together. As explained by Microsoft program manager Jonathan Aneja, "The intent is to make the languages advance together. When major functionality is introduced in one language, it should appear in the other as well. ... [T]hat any task you can do in one language should be as simple in the other." To this end, with version 4.0 C# now supports optional parameters and named arguments, two features that have long been part of Visual Basic's vernacular. And, likewise, Visual Basic has been updated to include a number of C# features that it was previously missing. This article explores some of these new features that were added to Visual Basic 2010. Read on to learn more! Read More >

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• Visual Basic 2010 Language Enhancements

  Earlier this month Microsoft released Visual Studio 2010, the .NET Framework 4.0 (which includes ASP.NET 4.0), and new versions of their core programming languages: C# 4.0 and Visual Basic 10 (also referred to as Visual Basic 2010). Previously, the C# and Visual Basic programming languages were managed by two separate teams within Microsoft, which helps explain why features found in one language was not necessarily found in the other. For example, C# 3.0 introduced collection initializers, which enable developers to define the contents of a collection when declaring it; however, Visual Basic 9 did not support collection initializers. Conversely, Visual Basic has long supported optional parameters in methods, whereas C# did not. Recently, Microsoft merged the Visual Basic and C# teams to help ensure that C# and Visual Basic grow together. As explained by Microsoft program manager Jonathan Aneja, "The intent is to make the languages advance together. When major functionality is introduced in one language, it should appear in the other as well. ... [T]hat any task you can do in one language should be as simple in the other." To this end, with version 4.0 C# now supports optional parameters and named arguments, two features that have long been part of Visual Basic's vernacular. And, likewise, Visual Basic has been updated to include a number of C# features that it was previously missing. This article explores some of these new features that were added to Visual Basic 2010. Read on to learn more! Read More >Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Google+ Hangouts API v1.2

  Google+ Hangouts API v1.2 We just launched v1.2 of the Hangouts API. Join Jonathan Beri and Jenny Murphy as they discuss the improvements and new features included in this release. After that, they'll answer your questions about the Hangouts API. 0:44 - Introductions 2:04 - What's new in Hangouts API v1.2 - developers.google.com 7:39 - Why can't I use the same URL for multiple ImageResources? 12:20 - The YouTube live ID in the Hangouts API 13:59 - Does onYouTubeLiveIdReady fire when new participants join? 15:10 - Can the 18+ flag be exposed in the Hangouts API? 15:50 - Can I use the share button or +1 button to target my Hangout App? 18:20 - When will Google+ pages be able to launch apps in their hangouts? 19:00 - Allen has been using the history API to log use of his Hangout Apps. 19:51 - Will this hangout be archived? - Google+ Platform YouTube playlist: www.youtube.com 20:20 - Is there a way for a user to remove a plugin from their hangout? 21:44 - Why is the self view in hangouts mirrored? 23:45 - Can hangouts support multiple cameras and control them via the API? Can take snapshots? 26:37 - It would be really cool if the hangout button could specify the invitation list. - Google+ issue tracker: code.google.com 28:40 - Can the REST API expose hangout metadata? From: GoogleDevelopers Views: 1350 43 ratings Time: 31:35 More in Science & Technology

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• Google+ Platform Office Hours for March 21, 2012: JavaScript and the REST APIs

  Google+ Platform Office Hours for March 21, 2012: JavaScript and the REST APIs It's a blast from the past. Here's the video from our office hours held on the 20th of March. In this session Jonathan and Wolff guided you through using the REST APIs with JavaScript. Get the source code: goo.gl Discuss this video on Google+: goo.gl 1:05 - How to use JSONP to access the REST APIs in JavaScript 2:30 - Setting up a new project in the API console 7:06 - The client libraries, what are they? 8:39 - Using the JavaScript client library to reimplement our example 13:27 - About OAuth and private resources 14:26 - Creating an OAuth client using the API console - The JavaScript client library discussion group - goo.gl 24:14 - Using the JavaScript client library and REST APIs from within a hangout - hangoutbots.blogspot.com Q&A 19 - Are you planning to change the +1 button back? 20:14 - Will this video be posted to YouTube? (Spoiler: the answer is yes) 20:43 - Do you read your issues list? - The Google+ platform issue tracker: goo.gl From: GoogleDevelopers Views: 2808 33 ratings Time: 27:03 More in Science & Technology

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• Want to book hotel stay using Bitcoin? Book using Expedia.com

  - by Gopinath

  The online travel booking leader Expedia announced that it started accepting Bitcoins for booking hotels on its website. For those who are new to Bitcoin, it is a digital currency in which transactions can be performed without the need for a central bank – its more like internet of currency. At the moment Expedia is accepting Bitcoin payments only for hotel bookings and in the future it may allow flights and vacation packages bookings. When Expedia customers wants to pay for a hotel using Bitcoin then they are transferred to Coinbase, a third party bit coin processor, for accepting the payments and then they are redirected back to Expedia.com to complete booking. This simple process would definitely drive mainstream adoption of Bitcoin – a win-win situation for digital currency users as well as for the travel company as they save a lot on card processing fees. Online retailers pay around 3% of transaction amount as fees for credit card processing companies like Visa & Master when they accept cards, but Coinbase charges a fee of just 1 percent for processing Bitcoins. Irrespective of customers adoption to Bitcoin based payments on Expedia as well as the savings on transaction fees, this move would give bragging rights to Expedia being the first e-commerce giant to accept digital currency! Image credit: Jonathan Caves

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• Oracle University Seminars April/May/June 2012

  - by A&C Redaktion

  Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} Oracle University's Expert Seminars are exclusive events delivered by top experts with years of experience in working with Oracle products. The seminars topics cover the breadth of the Oracle portfolio and are aimed at helping you to get the most of your Oracle products and to stay connected with new technologies. We currently have the following events scheduled: RAC Performance Tuning Online with Arup Nanda - 30 Apr 2012 Understanding Explain Plans & Index Utilization Online with Dan Hotka - 8-9 May 2012 Writing Optimal SQL & Troubleshooting & Tuning with Jonathan Lewis, Düsseldorf, 9-10 May 2012 Flashback Techniques in Oracle11g with Carl Dudley, München, 14 May 2012 Minimize Downtime with Rolling Upgrade using Data Guard with Uwe Hesse, München, 16 May 2012 Enterprise Business Intelligence 11g Advanced Development Online with Mark Rittman – 24-25 May Mastering Backup & Recovery with Francisco Munoz Alvarez, Düsseldorf, 29-30 May 2012 Real World Java EE 6 – Re-thinking Best Practice with Adam Bien, München, 15 Jun 2012

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• How Do Top Performing High Tech Companies Measure Online Marketing Success?

  - by Charles Knapp

  You might expect a focus on Net Promoter scores, open rates, and click metrics. The real answers from top performers may surprise you. I've been working for a few months with Aberdeen Group and colleagues from IBM and Oracle to survey high technology firms worldwide on best practices in marketing and channel sales effectiveness.  Now, we will share the results of our original customer research in a new white paper and webcast. Register today to learn how leading High Tech companies are increasing their Return on Marketing Investment (ROMI) and growing channel sales revenue. Discover how top performing high tech companies manage and use customer data, measure marketing spend effectiveness, and support internal and channel sales. Learn how best in class high tech companies use enterprise data throughout their customer lifecycle -- messaging to leads, selling to prospects, and serving customers. Our speakers will be: Peter Ostrow, Research Director - Sales Effectiveness, Aberdeen Group David Lasher, Global Business Services Partner, IBM Jonathan Oomrigar, Vice President, Global High Technology Business Unit, Oracle Reserve your place now! This global webinar is on Tuesday, November 15, 10-11 am PST / 1-2 pm EST / 6-7 GMT / 7-8 CET

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• Standards Matter: The Battle For Interoperability Continues

  - by michael.rowell

  Great Article, although it is a little dated at this point. Information Week Article Standards Matter: The Battle for Interoperability goes on Summary If you're guilty of relegating standards support to a "nice to have" feature rather than a requirement, you're part of the problem. If you want products to interoperate, be prepared to walk away if a vendor can't prove compliance. Don't be brushed off with promises of standards support "on the road map." The alternative is vendor lock-in and higher costs, including the cost of maintaining systems that don't work together. Standards bodies are imperfect and must do better. The alternative: splintered networks and broken promises. The point: "The secret sauce to a successful 'working standard' isn't necessarily IETF or another longstanding body," says Jonathan Feldman, director of IT services for the city of Asheville, N.C., and an InformationWeek Analytics contributor. "Rather, an earnest and honest effort by a group that has governance outside of a single corporation's control is what's important." In order to have true interoperability vendors as well as customers must be actively engaged in the standards process. Vendors must be willing to truly work together and not be protecting an existing product. Customers must also be willing to truly to work together and not be demanding a solution that only meets their needs but instead meets the needs of all participants. Ultimately, customers must be willing to reward vendor compliance by requiring compliance in products and services that they purchase and deploy. Managers that deploy systems without compliance to standards are only hurting themselves. Standards do matter. When developed openly and deployed compliantly standards deliver interoperability which provides solid business value.

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